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| Mirrors > Home > MPE Home > Th. List > funcnv0 | Structured version Visualization version GIF version | ||
| Description: The converse of the empty set is a function. (Contributed by AV, 7-Jan-2021.) |
| Ref | Expression |
|---|---|
| funcnv0 | ⊢ Fun ◡∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | fun0 6563 | . 2 ⊢ Fun ∅ | |
| 2 | cnv0 6103 | . . 3 ⊢ ◡∅ = ∅ | |
| 3 | 2 | funeqi 6519 | . 2 ⊢ (Fun ◡∅ ↔ Fun ∅) |
| 4 | 1, 3 | mpbir 231 | 1 ⊢ Fun ◡∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ∅c0 4273 ◡ccnv 5630 Fun wfun 6492 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2708 ax-sep 5231 ax-nul 5241 ax-pr 5375 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-mo 2539 df-clab 2715 df-cleq 2728 df-clel 2811 df-ral 3052 df-rex 3062 df-rab 3390 df-v 3431 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-nul 4274 df-if 4467 df-sn 4568 df-pr 4570 df-op 4574 df-br 5086 df-opab 5148 df-id 5526 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-fun 6500 |
| This theorem is referenced by: f10 6813 pthdlem1 29834 0trl 30192 0pth 30195 |
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